IBM SY31-0458-3 Section 12 Data Communications free download

File name SY31-0458-3_Section_12_Data_Communications.pdf

Contents DATA COMMUNICATIONS. . 12-1 Error Conditions . 12-54 INTRODUCTION 12-1 Adapter Check 12-54 Data Communications Systems 12-1 Data Set (Not) Ready 12-55 Data Communications Networks . 12-1 Abortive Disconnect . 12-55 Point-to- Point Network . . . 12-1 Receive Time-out . 12-55 Multipoint Network . . . . . 12-1 Invalid ASCII Character 12-55 Binary Synchronous Communications 12-2 Invalid Frame . 12-55 BSC Message Format . . . . . . 12-2 Secondary SDLC Time-out (Inactivity Transmit and Receive Storage Contents of Timer) 12-55 Message . . . . . . . . . . . . . . 12-4 Primary SDLC Time-out (Idle Detect) EBCDIC, ASCII, and Line Control Characters 12-5 and Nonproductive Timer) . 12-55 Synchronous Data Link Control 12-6 Block/Frame Check Error 12-55 Frame Format . . . . . . . . . . . . . 12-6 DBO Parity . 12-55 Control Field Formats . . . . . . . . . . 12-7 Diagnostics . 12-56 Primary Station Commands and Secondary Diagnostic Mode and Wrap Test 12-56 Station Responses . . . . . . . . . . . 12-8 Internal Clock Feature 12-60 Examples of SDLC Commands and Responses 12-9 EIA/CCITT Line Adapter 12-61 Systems Network Architecture 12-10 MODEMS 12-62 SNA/SDLC Data Relationship 12-10 IBM 1200 BPS Integrated Modem 12-62 Types of Network Addressable Units 12-10 Nonswitched Network Interface . 12-62 Physical Configuration 12-10 Switched Network Interface 12-64 SNA/SDLC Buffer 12-12 1200 BPS Transmit Operations 12-66 Modems and Interfaces 12-19 Receive Operations 12-66 COMMUNICATIONS ADAPTER 12-20 Automatic Answering 12-66 Data Flow 12-20 1200 BPS Integrated Modem Tests 12-67 Functional Units . . . 12-21 Line Plate for Public Switched Network 12-68 Adapter Controls . 12-24 IBM 2400 BPS Integrated Modem 12-68 System Level Interface 12-28 Operation